I make sure the coil is tight every time I refill the tank because I learned early on that was causing it to leak out the air flow holes, maybe I'm tightening it too much? My juice does seem pretty thin as well though.. Do you think it's dangerous that it's doing this? Mostly after sitting overnight is when I notice this happening.
I Wouldn't say a little e-liquid Seepage is dangerous. More of a PITA.
BTW - Q-Tips work great for Cleaning Out any e-Liquid that gets in a mods 510 connector.